Results 131 to 140 of about 546 (164)
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Modeling the Influence of Moulin Shape on Subglacial Hydrology
Journal of Geophysical Research F: Earth Surface, 2022AbstractSubglacial models represent moulins as cylinders or cones, but field observations suggest that the upper part of moulins in the Greenland Ice Sheet has more complex shapes. These more complex shapes should cause englacial water storage within moulins to vary as a function of depth, a relationship not currently accounted for in models.
Kristin Poinar +2 more
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Antarctica's subglacial hydrology
2023The components Antarctica's subglacial hydrology -for instance water sources, sinks, flow paths and catchments- are still poorly constrained.  In this work we assess the subglacial hydrology of the continent at high resolution (500m) using (1) water inputs from frictional melting derived with a higher order ice flow model combined with ...
Mauro A. Werder +4 more
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Revisiting subglacial hydrology as an origin for Mars' valley networks
Earth and Planetary Science Letters, 2021Although the nature of the early Martian climate is a matter of considerable debate, the presence of valley networks (VN) provides unambiguous evidence for the presence of liquid water on Mars’ surface. A subaerial fluvial origin of VN is at odds with the expected phase instability of near-surface water in the cold, dry Late Noachian climate ...
Jacob Buffo +4 more
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Quaternary Science Reviews, 1997
Abstract The size and shape of subglacial flow pathways exert a strong influence over the pressure and speed at which meltwaters are routed through glaciers. These characteristics, in turn, influence glacier sliding velocity and the quantity and quality of bulk meltwaters discharging from glaciers.
Bryn Hubbard, Peter Nienow
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Abstract The size and shape of subglacial flow pathways exert a strong influence over the pressure and speed at which meltwaters are routed through glaciers. These characteristics, in turn, influence glacier sliding velocity and the quantity and quality of bulk meltwaters discharging from glaciers.
Bryn Hubbard, Peter Nienow
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Subglacial hydrology and ice stream margin locations [PDF]
Journal of Geophysical Research F: Earth Surface, 2015 AbstractFast‐flowing ice streams in West Antarctica are separated from the nearly stagnant ice in the adjacent ridge by zones of highly localized deformation known as shear margins. It is presently uncertain what mechanisms control the location of shear margins and possibly allow them to migrate.
James R Rice +2 more
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Subglacial hydrology as a control on emergence,scale, and spacing of ice streams [PDF]
Journal of Geophysical Research F: Earth Surface, 2015 AbstractObservations have long associated ice streams with the presence of meltwater at the bed. More recently, theoretical models have been able to reproduce ice stream behavior as a consequence of the coupled dynamics of ice and subglacial meltwater.
Richard Katz
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Modeling the impact of moulin shape on subglacial hydrology
2022Subglacial models represent moulins as cylinders or cones, but field observations suggest the upper part of moulins in the Greenland Ice Sheet have more complex shapes. These more complex shapes should cause englacial water storage within moulins to vary as a function of depth, a relationship not currently accounted for in models.
Celia Trunz +5 more
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Modelling Subglacial Hydrology under Future Climate Scenarios in Wilkes Subglacial Basin, Antarctica
2022<p>The Greenland and Antarctic ice sheets have differing climates, which makes surface melt a significant hydrological source in Greenland but not currently in Antarctica. Due to changing climate and warming air temperatures, Antarctica is predicted to experience more surface meltwater in the future.
Kevin Siu +4 more
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Glacier hydrology and the potential for subglacial karstification
Norsk Geografisk Tidsskrift - Norwegian Journal of Geography, 1984Contemporary models of subglacial hydrology identify two quasi-independent hydrologic systems at the bed of temperate alpine glaciers: a dendritic, low pressure conduit network and a more extensive, high pressure regelation film. Observations in Castleguard Cave beneath the Columbia Icefield suggest that this distinction continues into the groundwater ...
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Using drones to investigate subglacial hydrology
Nature Reviews Earth & Environmentexaly +2 more sources